ISRO Mechanical Engg. : Strength of Materials Booster Quiz 2

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Question 1

A solid shaft of 100 mm diameter transmits 160 HP at 200rpm. The modulus of rigidity c= 8 ×10⁵ kg/cm². Then the maximum angle of twist for a length of 6 meter is

• A5 °
• B2.5 °
• C3.2 °
• D2 °

Question 2

A thin-walled cylinder with closed ends for which inner radius is 0.50 meter and outer radius is 0.52 meter, is subjected to internal pressure 2 MPa. The absolute maximum shearing stress on the inner surface of the cylinder shall be ____________.

• A18.75 MPa
• B37.5 MPa
• C12.5 MPa
• D13 MPa

Question 3

Two steel rails each of 12 m length are laid with a gap of 1.5 mm at ends at a temperature of 24 °C. The thermal stress( N/mm²⁾ produced at a temperature of 40 °C is (take E = 2 x10⁵ N/mm², coefficient of thermal expansion = 12 x 10^-6/ °C)

• A10.5
• B12.5
• C13.4
• D15.5

Question 4

For the state of stress shown in the above figure, normal stress acting on the plane of maximum shear stress is

• A25 MPa tension
• B75 MPa compression
• C25 MPa compression
• D75 MPa tension

Question 5

A Mohr’s circle reduces to a point when the body is subjected to

• APure shear
• BUniaxial stress only
• CEqual and opposite axial stresses on two mutually perpendicular planes, the planes being free of shear
• DEqual axial stresses are on two mutually perpendicular planes, the planes being free of shear

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